The thin plastic rod of length L = 10.0 cm in the figure below has a nonuniform linear charge density = cx, where c = 49.9 pC/m.

The thin plastic rod of length L = 10.0 cm in the figure below has a nonuniform linear charge density λ = cx, where c = 49.9 pC/m. (a) With V = 0 at infinity, find the electric potential at point P2 on the y axis, a distance y = D = 3.56 cm. (b) Find the electric field component Ey at P2. (c) Why cannot the field component Ex at P2 be found using the result of (a)?